Please follow following steps blindly to get wireless working on ubuntu machine.

Here are the steps...

On a fresh clean Ubuntu machine:
1. Disable the "Support for Atheros 802.11 wireless LAN cards" on Hardware Drivers, and reboot your box.

2. In a terminal:

2.1 Updates all package lists
# sudo apt-get update

2.2 Update driver.
# sudo apt-get install linux-backports-modules-intrepid-generic